The 2001 Sierra 1500 is a workhorse GMT800 platform truck with bulletproof engine blocks but critical weaknesses in the transmission cooling circuit, intake manifold gaskets on the 4.3L and 5.3L, and fuel pressure regulator failures that can destroy engines if ignored.
Transmission Oil Cooler Line Failure at Radiator
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Pink milkshake in transmission fluid (coolant contamination), Transmission slipping or delayed engagement after radiator leak, Coolant in transmission pan during service, Catastrophic transmission failure within days of mixing
Fix: Replace radiator with upgraded external trans cooler, flush transmission multiple times, often requires transmission rebuild if coolant got circulated. 8-12 hours labor if trans needs R&R.
Estimated cost: $1,200-3,800
Intake Manifold Gasket Failure (4.3L V6 and 5.3L V8)
Common · medium severity
Typical onset: 60,000-120,000 mi
Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Rough idle or misfire codes, Coolant smell from HVAC vents
Fix: Replace intake manifold gaskets (Fel-Pro or OEM updated design critical), often need new intake bolts and coolant elbows. 4-6 hours labor.
Estimated cost: $600-1,200
Fuel Pressure Regulator Failure with Vacuum Leak (4.8L/5.3L)
Common · high severity
Typical onset: 70,000-140,000 mi
Symptoms: Raw fuel smell from exhaust, Black smoke and fouled spark plugs, Severe fuel economy drop (down to 8-10 mpg), Engine hydrolocking if raw fuel floods cylinders overnight
Fix: Replace fuel pressure regulator on fuel rail, inspect for cylinder wash and bearing damage if run long-term. Can require full engine rebuild if gas diluted oil for extended period. 1.5-2 hours labor for regulator alone.
Estimated cost: $200-400 (regulator only), $3,500-6,000 if engine damaged
4L60E/4L80E Transmission 3-4 Clutch Pack Failure
Common · medium severity
Typical onset: 120,000-180,000 mi
Symptoms: Slipping or flare on 3-4 upshift, No 4th gear (stays in 3rd on highway), Burnt transmission fluid smell, Check engine light with P0734 code
Fix: Transmission rebuild with updated 3-4 clutch pack, Alto or Raybestos friction plates recommended. 8-10 hours labor for R&R and rebuild.
Estimated cost: $1,800-2,800
Fuel Pump Failure
Occasional · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: No start or extended crank time when hot, Loss of power under acceleration, Stalling at idle after driving, Fuel pump whine from tank area
Fix: Drop fuel tank and replace pump assembly (AC Delco recommended over aftermarket). 2-3 hours labor.
Estimated cost: $500-800
Steering Shaft Clunk (Intermediate Shaft)
Common · low severity
Typical onset: 50,000-100,000 mi
Symptoms: Clunk or knock felt in steering wheel over bumps, Noise when turning at low speed, Worse in cold weather
Symptoms: Loud ticking from engine bay that increases with RPM, Exhaust smell in cabin, Visible soot around manifold-to-head joint
Fix: Drill out broken bolts, re-tap holes, install new manifold bolts with anti-seize. Driver side requires lifting engine or frame drop. 4-6 hours labor worst case.
Estimated cost: $400-900
Owner tips
Install an external transmission cooler immediately if towing — the factory radiator setup is a ticking time bomb
Check for pink trans fluid every oil change; catching coolant contamination early saves $2,000+
Use only AC Delco or Fel-Pro intake gaskets — Dorman and cheap brands fail within 20k miles
Replace fuel pressure regulator proactively around 100k mi on Vortec V8s to avoid engine damage
Extended-life Dexcool coolant turns acidic and eats gaskets — flush and switch to conventional green or use fresh Dexcool every 3 years
Solid truck if the trans cooler and intake gaskets have been addressed — avoid high-mileage examples with unknown maintenance history or any hint of coolant/trans fluid mixing.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Side post terminals standard on GM trucks; battery located under hood on driver side
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 1999-2002 GMC Sierra 1500 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Body Control Module (BCM)2.8 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Behind instrument cluster, center of dash above steering column
📍 Integrated within BCM and ignition lock cylinder sensor
🔧 Tech 2 with TIS2000
⚠️ Passlock II system; 10-minute relearn procedure or Tech 2 required after BCM/PCM replacement
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
CERTAIN FEDERAL-MOGUL REPLACEMENT WHEEL HUB ASSEMBLIES WITH THE BRAND NAMES: NATIONAL, CARQUEST P/NOS. 515020, 515021, 515025, 515053, 515054, 515059, AND 515060, SHIPPED BETWEEN JANUARY 23, 2006, AND DECEMBER 20, 2007, SOLD FOR LIGHT DUTY AND MEDIUM DUTY TRUCKS. THE INBOARD RETENTION NUT USED TO MAINTAIN HUB BEARING ASSEMBLY CAN LOOSEN RESULTING IN AN ABS LIGHT INDICATION, NOISE, AND/OR WHEEL SEPARATION.
Consequence: WHEEL SEPARATION CAN RESULT IN A VEHICLE CRASH.
Remedy: FEDERAL-MOGUL WILL NOTIFY CUSTOMERS AND WILL REPLACE THE HUB ASSEMBLY FREE OF CHARGE. THE RECALL BEGAN ON FEBRUARY 7, 2008. OWNERS CAN CONTACT FEDERAL-MOGUL TOLL-FREE AT 877-489-6659.
SERVICE BRAKES, AIR · 06E050000
2006-06-06
CERTAIN FEDERAL-MOGUL NATIONAL AND CARQUEST AFTERMARKET HUB ASSEMBLIES, P/N 515058, SOLD FOR USE ON 2001-2006 GENERAL MOTORS 1500 AND 2500 4WD TRUCKS. ON THE SUBJECT HUB ASSEMBLIES, THE ABS SENSOR CORD DEPARTS FROM THE HUB ASSEMBLY AT A 90 DEGREE ANGLE. AS A RESULT, THERE IS A FIT ISSUE WITH THE BRAKE ROTOR DUST SHIELD INTERFERING WITH THE ABS SENSOR CORD. IF THE HUB ASSEMBLY IS INSTALLED DESPITE THIS INTERFERENCE, THE GAP BETWEEN THE ABS SENSOR AND THE TONE WHEEL MAY BE ALTERED. THIS MAY WEAKEN THE OUTPUT OF THE ABS SENSOR. DIMINISHED OUTPUT COULD RESULT IN AN UNWANTED ABS ACTIVATION AT LOW SPEEDS AND STOPPING DISTANCE COULD BE AFFECTED.
Consequence: IF STOPPING DISTANCE IS LIMITED, A VEHICLE CRASH COULD OCCUR.
Remedy: FEDERAL-MOGUL WILL NOTIFY ITS OWNERS AND WILL EITHER CREDIT THE CUSTOMERS ACCOUNT OR REPLACE THE UNIT. THE RECALL IS EXPECTED TO BEGIN DURING JUNE 2006. OWNERS CAN CONTACT FEDERAL-MOGUL CUSTOMER SERVICE AT 1-800-563-8507 EXT 3530.
FUEL SYSTEM, GASOLINE · 06E043000
2006-05-19
CERTAIN REPLACEMENT FUEL FILTERS, FRAM BRAND NAME P/N G3727, WITH DATE CODES X52911 THROUGH X60801 SEQUENTIALLY OR X600141 AND A MEXICO COUNTRY OR ORIGIN MARKING ON THE FUEL FILTER HOUSING MANUFACTURED FROM OCTOBER 18, 2005, THROUGH MARCH 21, 2006, SOLD FOR USE ON THE VEHICLES LISTED ABOVE AND ON CERTAIN SCHOOL BUSES. (TO SEE THE SCHOOL BUS ENGINE SIZES, CLICK ON "DOCUMENT SEARCH" AND THEN "BUS APPLICATIONS"). THE CONNECTOR ON THE FUEL FILTER WAS NOT MANUFACTURED TO HONEYWELL'S SPECIFICATION. AS A RESULT, THE O-RING MAY NOT SEAT CORRECTLY ON THE FUEL LINE.
Consequence: THIS CONDITION MAY CAUSE AN INADEQUATE SEAL AT THE CONNECTION, POTENTIALLY LEADING TO A FUEL LEAK. IN THE PRESENCE OF AN IGNITION SOURCE, A FIRE COULD OCCUR.
Remedy: HONEYWELL WILL NOTIFY OWNERS AND REPLACE THE FUEL FILTERS FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 18, 2006. OWNERS MAY CONTACT FRAM CUSTOMER SERVICE AT 1-800-890-2075 (OPTION 1).
EQUIPMENT ADAPTIVE/MOBILITY · 04V562000
2004-11-26
ON CERTAIN VANS EQUIPPED WITH SURE-LOK WHEELCHAIR SECUREMENT SYSTEMS, THE SPROCKET TEETH OF THE RETRACTOR ASSEMBLY IS OUT OF ALIGNMENT.
Consequence: IN THE EVENT OF A VEHICLE CRASH, THE WHEELCHAIR MAY NOT BE ADEQUATELY SECURED POSSIBLY RESULTING IN INJURIES TO A WHEELCHAIR OCCUPANT.
Remedy: DEALERS WILL INSPECT AND REPLACE THE WHEELCHAIR SECUREMENT RETRACTORS AS NECESSARY. SURE-LOK WILL HANDLE THE REPAIRS FOR THIS CAMPAIGN. OWNERS SHOULD CONTACT SURE-LOCK AT 1-908-231-1804 OR MOBILITYWORKS AT 1-800-769-8267.
EQUIPMENT:OTHER:LABELS · 01V125000
2001-04-10
VEHICLE DESCRIPTION: CERTAIN 2-WHEEL DRIVE PICKUP TRUCKS FAIL TO COMPLY WITH REQUIREMENTS OF FMVSS NO. 120, "TIRE SELECTION AND RIMS FOR MOTOR VEHICLES OTHER THAN PASSENGER CARS." THE PROBLEM WAS CAUSED BY A COMPUTER ERROR THAT RESULTED IN THE CERTIFICATION LABEL LISTING TIRE SIZE AND INFLATION PRESSURE INFORMATION THAT DIFFER FROM THE TIRE SIZE AND THE INFLATION PRESSURE INFORMATION FOR THE TIRES ON THE VEHICLE. IF THE VEHICLE OWNER OR SOMEONE SERVICING THE VEHICLE INFLATES THE TIRES ACCORDING TO THE PRESSURE SPECIFIED ON THE LABEL VERSUS THE APPROPRIATE PRESSURE FOR THE TIRES, THE TIRES COULD BE UNDER-INFLATED OR OVER-INFLATED DEPENDING ON THE TIRES MOUNTED ON THE VEHICLE.
Consequence: IF THE TIRES ARE UNDER-INFLATED, IT COULD REDUCE THE TREAD LIFE OF THE TIRE, AND THE TIRE COULD DEGRADE TO A POINT OF ALLOWING SUDDEN AIR LOSS. IF THE TIRES ARE OVER-INFLATED, IT COULD REDUCE THE TREAD LIFE OF THE TIRE AND INCREASE SUSCEPTIBILITY TO ROAD HAZARD DAMAGE. IF SUDDEN AIR LOSS OR A ROAD HAZARD CAUSES DAMAGE TO A TIRE, CONTROL OF THE VEHICLE COULD BE ADVERSELY AFFECTED AND COULD RESULT IN A VEHICLE CRASH.
Remedy: OWNERS WILL BE PROVIDED WITH A NEW LABEL AND INSTALLATION INSTRUCTIONS. HOWEVER, A DEALER CAN INSTALL THE LABEL IF THE OWNER SO DESIRES. OWNER NOTIFICATION BEGAN MAY 31, 2001. OWNERS WHO DO NOT RECEIVE THE LABEL AND INSTALLATION INSTRUCTIONS WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.
Fuel economy (EPA)
City
14mpg
Highway
18mpg
Combined
15mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Standard Pickup Trucks 2WD
Wiper blades
GMT800 platform. Pickup trucks do not have rear wipers.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2001 GMC Sierra 1500 5.3L V8 Vortec and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.